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QUESTION
3 balls numbered 1, 2 and 3 are in a box. One ball is removed at random and placed back; then another ball is extracted.
3 balls numbered 1, 2 and 3 are in a box. One ball is removed at random and placed back; then another ball is extracted. Find the mathematical expectation, variance, and standard deviation of random variable X representing the absolute value of the difference between the 2 extracted numbers
